book Maths Puzzle Numerical Ability

how do you solve equations that have different logs: log5(x-4) = log7x, solve for x
The 5 and the 7 are little

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Hello,I am a junior in Honors Pre-Calculus and I am not sure how to do these problems:

1) Suppose you have 102m of fencing to make two side-by-side rectangluar enclosures, as sh
4/(x-4)^2=1

i having alot of trouble with this one. I think i need to get the numerator over to the other side.